Packages

sealed abstract class Pull[+F[_], +O, +R] extends AnyRef

A p: Pull[F,O,R] reads values from one or more streams, returns a result of type R, and produces a Stream[F,O] when calling p.stream.

Any resources acquired by p are freed following the call to stream.

Laws:

Pull forms a monad in R with pure and flatMap:

  • pure >=> f == f
  • f >=> pure == f
  • (f >=> g) >=> h == f >=> (g >=> h) where f >=> g is defined as a => a flatMap f flatMap g

raiseError is caught by handleErrorWith:

  • handleErrorWith(raiseError(e))(f) == f(e)
Source
Pull.scala
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Abstract Value Members

  1. abstract def mapOutput[O2](f: (O) => O2): Pull[F, O2, R]

    Applies the outputs of this pull to f and returns the result in a new Pull.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def >>[F2[x] >: F[x], O2 >: O, R2](p2: => Pull[F2, O2, R2]): Pull[F2, O2, R2]

    Alias for flatMap(_ => p2).

  5. def as[R2](r2: R2): Pull[F, O, R2]

    Alias for _.map(_ => o2).

  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def attempt: Pull[F, O, Either[Throwable, R]]

    Returns a pull with the result wrapped in Right, or an error wrapped in Left if the pull has failed.

  8. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @HotSpotIntrinsicCandidate()
  9. def covary[F2[x] >: F[x]]: Pull[F2, O, R]

    Lifts this pull to the specified effect type.

  10. def covaryAll[F2[x] >: F[x], O2 >: O, R2 >: R]: Pull[F2, O2, R2]

    Lifts this pull to the specified effect type, output type, and resource type.

  11. def covaryOutput[O2 >: O]: Pull[F, O2, R]

    Lifts this pull to the specified output type.

  12. def covaryResource[R2 >: R]: Pull[F, O, R2]

    Lifts this pull to the specified resource type.

  13. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  15. def flatMap[F2[x] >: F[x], O2 >: O, R2](f: (R) => Pull[F2, O2, R2]): Pull[F2, O2, R2]

    Applies the resource of this pull to f and returns the result.

  16. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  17. def handleErrorWith[F2[x] >: F[x], O2 >: O, R2 >: R](h: (Throwable) => Pull[F2, O2, R2]): Pull[F2, O2, R2]

    If this terminates with Pull.raiseError(e), invoke h(e).

  18. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  19. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  20. def map[R2](f: (R) => R2): Pull[F, O, R2]

    Applies the resource of this pull to f and returns the result in a new Pull.

  21. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  22. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  23. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  24. def onComplete[F2[x] >: F[x], O2 >: O, R2 >: R](p2: => Pull[F2, O2, R2]): Pull[F2, O2, R2]

    Run p2 after this, regardless of errors during this, then reraise any errors encountered during this.

  25. def stream(implicit ev: <:<[R, Unit]): Stream[F, O]

    Interpret this Pull to produce a Stream, introducing a scope.

    Interpret this Pull to produce a Stream, introducing a scope.

    May only be called on pulls which return a Unit result type. Use p.void.stream to explicitly ignore the result type of the pull.

  26. def streamNoScope(implicit ev: <:<[R, Unit]): Stream[F, O]

    Interpret this Pull to produce a Stream without introducing a scope.

    Interpret this Pull to produce a Stream without introducing a scope.

    Only use this if you know a scope is not needed. Scope introduction is generally harmless and the risk of not introducing a scope is a memory leak in streams that otherwise would execute in constant memory.

    May only be called on pulls which return a Unit result type. Use p.void.stream to explicitly ignore the result type of the pull.

  27. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  28. def toString(): String
    Definition Classes
    AnyRef → Any
  29. def void: Pull[F, O, Unit]

    Discards the result type of this pull.

  30. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  31. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  32. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

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